Constitutive over-expression of a maize sucrose-phosphate synthase (SPS) gene in tobacco (Nicotiana tabacum) had major effects on leaf carbohydrate budgets with consequences for whole plant development. Transgenic tobacco plants flowered earlier and had greater flower numbers than wild-type plants. These changes were not linked to modified source leaf carbon assimilation or carbon export, altho...

The effects of 24-epibrassinolide (EBR) spray application on gas-exchange, chlorophyll fluorescence characteristics, Rubisco activity, and carbohydrate metabolism were investigated in cucumber (Cucumis sativus L. cv. Jinchun No. 3) plants grown in a greenhouse. EBR significantly increased the light-saturated net CO(2) assimilation rate (A(sat)) from 3 h to 7d after spraying, with 0.1 mg l(-1) E...

A split plot 3 by 4 experiment was designed to examine the impact of 15-week variable levels of nitrogen fertilization (0, 90, 180 and 270 kg N/ha) on the characteristics of total flavonoids (TF), total phenolics (TP), total non structurable carbohydrate (TNC), net assimilation rate, leaf chlorophyll content, carbon to nitrogen ratio (C/N), phenyl alanine lyase activity (PAL) and protein conten...

In the Arabidopsis mutant sdd1-1, a point mutation in a single gene (SDD1) causes specific alterations in stomatal density and distribution. In comparison to the wild type (C24), abaxial surfaces of sdd1-1 rosette leaves have about 2.5-fold higher stomatal densities. This mutant was used to study the consequence of stomatal density on photosynthesis under various light regimes. The increased st...

To evaluate daytime and nighttime carbon balance and assimilate export in soybean (Glycine max [L.] Merrill) leaves at different photon flux densities, rates of CO(2) exchange, specific leaf weights, and concentrations of sucrose and starch were measured at intervals in leaves of pod-bearing ;Amsoy 71' and ;Wells II' plants grown in a controlled environment room. Assimilate export was estimated...

The consequences of the addition of CO2 (1%) in cultures of S. platensis are examined in terms of biomass yield, cell composition and external medium composition. CO2 enrichment was tested under nitrogen saturating and nitrogen limiting conditions. Increasing CO2 levels did not cause any change in maximum growth rate while it decreased maximum biomass yield. Protein and pigments were decreased ...

The waterlogging tolerance and the physiological responses to this stress were tested in seedlings of Fraxinus angustifolia, an ash tree inhabiting riparian forests, and two provenances of the closely related Fraxinus excelsior, one derived from a riparian forest (FER) and one from a mountainous region (FEM). Besides visible damage, physiological parameters reflecting adaptations of plants to w...

Constitutive over-expression of a maize sucrosephosphate synthase (SPS) gene in tobacco (Nicotiana tabacum) had major effects on leaf carbohydrate budgets with consequences for whole plant development. Transgenic tobacco plants ̄owered earlier and had greater ̄ower numbers than wild-type plants. These changes were not linked to modi®ed source leaf carbon assimilation or carbon export, although ...